Pen with flashy barrel

Abstract

A pen comprises a barrel having a first tube and a second tube coaxially overlaying the first tube. The first tube has a pattern area defined by a plurality of parallel lines thereon; and the second tube is transparent and has a plurality of parallel protrusions formed thereon; wherein one of the first tube and the second tube is movable relative to another; and the parallel lines of the first tube are parallel with the parallel protrusions of the second tube.

1. A pen comprising:
 a penholder; 
 a refill, received in the penholder; 
 a driving mechanism configured to drive the refill to jut out from or draw back into the penholder; and 
 a barrel including a first tube and a second tube: the first tube having a pattern area defined by a plurality of parallel lines thereon: the second tube being transparent, coaxially overlaying the first tube and having a plurality of parallel protrusions formed thereon, wherein either one of the first and second tubes is movable relative to one another, and the parallel lines of the first tube are parallel with the parallel protrusions of the second tube; 
 wherein the first tube of the barrel is secured on the penholder, and the second tube is capable of driving the driving mechanism. 
 
     
     
       2. The pen of  claim 1 , wherein the second tube has an inner tube engaged with the driving mechanism. 
     
     
       3. A pen comprising:
 a penholder; 
 a refill, received in the penholder; 
 a driving mechanism configured to drive the refill to jut out from or draw back into the penholder; and 
 a barrel including a first tube and a second tube; the first tube having a pattern area having a plurality of parallel lines which includes first strips served as a foreground of the pattern area, and second strips paralleled, staggered with the first stripes and served as a background of the pattern area; and the second tube being transparent, coaxially overlaying the first tube and having a plurality of parallel protrusions formed thereon, wherein either one of the first and second tubes is movable relative to one another, and the parallel lines of the first tube are parallel with the parallel protrusions of the second tube; 
 wherein the first tube of the barrel is secured on the penholder, and the second tube is capable of driving the driving mechanism. 
 
     
     
       4. The pen of  claim 3 , wherein the second tube has an inner tube engaged with the driving mechanism.